Which of the following is not true of cellulose?
A. It is the most abundant organic compound on Earth.
b. it differs from starch because of the configuration of glucose and the geometry of the glycosidic linkage.
c. It may be hydrogen-bonded to neighboring cellulose molecules to form microfibrils.
d. Few organisms have enzymes that hydrolyze this glycosidic linkages.
e. Its monomers are glucose with nitrogen containing appendages
Ans: e. Its monomers are glucose with nitrogen containing appendages
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In cancer cells one allele of the tumor suppressor gene p53 is frequently mutated so that the protein is inactive, not produced, or deleted
The other allele will usually have a normal sequence and the promoter remains intact but the gene is not expressed. Sequencing with sodium bisulfite modification of DNA can be used to detect which cytosines are methylated. If the cancer cell DNA is sequenced what would be the anticipated results? A. Cytosines in or near the promoter region will be methylated B. Cytosines in or near the promoter will not be methylated C. Cytosines in the coding region will have an increased mehtylation D. There will be no differences in the methylation pattern of the promoter of p53 from a cancer cell and a normal cell
Of the following parts of the GI tract, the greatest amount of nutrient absorption takes place in the
a. stomach. b. small intestine. c. colon. d. pancreas. e. esophagus.
Which biochemical unit encodes a single protein?
If one is attempting to determine the influence of genes or the environment on phenotypic variation, inbred strains with individuals of a relatively homogeneous or constant genetic background are often used. Variation observed between different inbred
strains reared in a constant or homogeneous environment would likely be caused by genetic factors. What would be the source of variation observed among members of the same inbred strain reared under various environmental conditions? What will be an ideal response?